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Than I guess you ought to ask another 17 chemistry tutors.
On 7/7/2017 12:00 PM, phys-l-request@mail.phys-l.org wrote:
Message: 1
Date: Thu, 6 Jul 2017 16:34:55 -0500
From: brian whatcott <betwys1@sbcglobal.net>
Not sure where I got this from, many years ago; possibly a chemistry
tutor: when you have no idea how many samples would constitute a
reasonable number, take at least 18 samples :-)
Brian W